ext4: fix potential NULL pointer dereference in ext4_fill_super()

By mistake we fail to return an error from ext4_fill_super() in case
that ext4_alloc_sbi() fails to allocate a new sbi. Instead we just set
the ret variable and allow the function to continue which will later
lead to a NULL pointer dereference. Fix it by returning -ENOMEM in the
case ext4_alloc_sbi() fails.

Fixes: cebe85d ("ext4: switch to the new mount api")
Reported-by: kernel test robot <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Lukas Czerner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Theodore Ts'o <[email protected]>
Cc: [email protected]

Author: Lukas Czerner

fs/ext4/super.c

@@ -5541,7 +5541,7 @@ static int ext4_fill_super(struct super_block *sb, struct fs_context *fc)
 
 	sbi = ext4_alloc_sbi(sb);
 	if (!sbi)
-		ret = -ENOMEM;
+		return -ENOMEM;
 
 	fc->s_fs_info = sbi;